*{
    margin: 0;
    padding: 0;
    font-family: microsoft yahei, Arial, sans-serif;
    font-size: 14px
}

.list_dt {
    background: #333;
    color: #fff;
    width: 120px;
    padding: 0 40px 0 20px;
    height: 34px;
    line-height: 34px;
    cursor: pointer;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    position: relative;
    border-bottom: 1px solid #464646
}

.list_dt:hover {
    background: #222
}

.list_dt:hover ._after {
    display: block;
    width: 3px;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    background: #4285f4
}

#open {
    background: #222
}

#open ._after {
    display: block;
    width: 3px;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    background: #4285f4
}

.list_dt_icon {
    position: absolute;
    right: 10px;
    top: 11px;
    display: block;
    width: 12px;
    height: 12px;
    background: url(../images/off.png) no-repeat;
    background-size: cover
}

#open .list_dt_icon {
    background: url(../images/open.png) no-repeat;
    background-size: cover
}

.list_dd {
    display: none
}

.list_li {
    background: #4e4e4e;
    list-style-type: none;
    color: #fff;
    width: 120px;
    padding: 0 30px;
    height: 34px;
    line-height: 34px;
    cursor: pointer;
    border-bottom: 1px solid #6b6b6b
}

.list_li:hover {
    background: #4285f4
}